Translation of Gymnasium

He also told me that he had build his scooter by himself. I could not understand how a doctor was able to build such a machine on his own. It seems that the circumstances made people capable of many things.
Let me summarize our meeting from Sunday, please give me feedback if something is unclear. I will send you the study material, including lessons and vocabulary lists to ensure the accuracy of training.
Usually I do not care too much about not getting change, but when you pay a 3 dollar ride with 50 dollars, you do actually expect change. We stood there for a while and neither of us knew what to do.